Direct determination of calcium, sodium and potassium in fermented milk products

Abstract

The aim of this study was the investigation of the possibilities of direct determination of calcium, sodium and potassium in the commercial and kombucha-based fermented milk products by flame photometry. Two procedures were used for sample preparation: simple dilution with water (direct method) and extraction with mineral acid. Calcium, sodium and potassium levels determined after mentioned sample preparation methods were compared. The results showed that the differences between the values obtained for the different sample treatment were within the experimental error at the 95% confidence level. Compared to the method based on extraction with mineral acid, the direct method is efficient, faster, simpler, cheaper, and operates according to the principles of Green Chemistry. Consequently, the proposed method for the direct determination of calcium, sodium and potassium could be applied for the rapid routine analysis of the mineral content in the fermented dairy products. [Projekat Ministarstva nauke Republike Srbije, br. III 46009

Brazilian infant dairy foods: mineral content and daily intake contribution

“…Therefore, the control of sodium intake is important, as the prevalence of elevated blood pressure and hypertension are increasing among children and adolescents (Falkner, 2017). Milk is not a rich source of sodium, thus milk and most of its derivatives do not usually present high levels of this mineral (Kravić et al , 2012). In the present study, the Requeijão cremoso had a much higher Na concentration (4.78±0.10 mg g −1 ) than that observed for other products (0.42±0.13 to 1.27±0.01 mg g −1 ), possibly due to salting procedure in Requeijão cremoso cheese manufacturing.…”

Characterization of Ladakhi churpe enriched with apricot and spinach

“…The determination of calcium, sodium and magnesium was carried out by flame photometry (direct method) as given by Kravic et al (2012) using flame photometer (Systronics, India) in air-butane flame. After the homogenization by mixing, 2.5 g of the sample was transferred to a calibrated flask, 2 cm 3 of 10% solution of lanthanum was added and diluted to a final volume of 50 cm 3 with distilled water.…”